17 20 20 triangle

Acute isosceles triangle.

Sides: a = 17   b = 20   c = 20

Area: T = 153.8832869417
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 50.30113268251° = 50°18'5″ = 0.87879237712 rad
Angle ∠ B = β = 64.84993365875° = 64°50'58″ = 1.13218344412 rad
Angle ∠ C = γ = 64.84993365875° = 64°50'58″ = 1.13218344412 rad

Height: ha = 18.10438669902
Height: hb = 15.38882869417
Height: hc = 15.38882869417

Median: ma = 18.10438669902
Median: mb = 15.63664957711
Median: mc = 15.63664957711

Inradius: r = 5.39993989269
Circumradius: R = 11.04773635333

Vertex coordinates: A[20; 0] B[0; 0] C[7.225; 15.38882869417]
Centroid: CG[9.075; 5.12994289806]
Coordinates of the circumscribed circle: U[10; 4.69551295017]
Coordinates of the inscribed circle: I[8.5; 5.39993989269]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 129.6998673175° = 129°41'55″ = 0.87879237712 rad
∠ B' = β' = 115.1510663413° = 115°9'2″ = 1.13218344412 rad
∠ C' = γ' = 115.1510663413° = 115°9'2″ = 1.13218344412 rad

Calculate another triangle




How did we calculate this triangle?

Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS.


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